Returning from the EU summit in Brussels, Morawiecki told journalists on Friday that arrangements made by EU leaders in the Belgian capital regarding Brexit were in Poland’s favour. He added that Poland's main concern was to ensure continued rights for Polish citizens in the UK, particularly in terms of social policy.

Morawiecki also said that he had spoken to British Prime Minister Theresa May on the sidelines of the summit on Thursday.

She also told Poland's PAP news agency that ensuring EU citizens’ rights in the UK and UK citizens’ rights in the EU was her “first priority.”

“The one million Polish citizens and 30,000 Polish businesses who have made a home in the UK have made a huge economic, social and cultural contribution to the fabric of our country… No EU citizen legally living in the UK needs to worry,” she said.

'Little green light of hope' on migration

Giving an impromptu news conference on board a plane bound for Warsaw, Morawiecki said another takeaway from the Brussels summit was that Poland's voice on migration issues was beginning to be heard more clearly.

He added he was bringing "a little green light of hope" from Brussels when it comes to how the migration problem can be resolved.

Morawiecki voiced satisfaction that the Brussels summit had formally launched the EU's Permanent Structured Cooperation (PESCO), a landmark defence pact that aims to boost military cooperation within the bloc. He added that Poland was interested in strengthening the EU's defensive capacity “in full agreement with NATO” because he said the Western military alliance was Poland's primary security guarantor.

Morawiecki also said he welcomed EU leaders’ decision to greenlight a plan to extend economic sanctions against Russia for another six months over Moscow's aggressive actions in Ukraine.

He said: "With the exception of a few smaller countries in southern Europe, everybody understands that sanctions against Russia must be extended because they are not only an element of a policy of pressure on Russia but also a symbol that the EU does not accept the annexation of Crimea and the war in eastern Ukraine.”

While in Brussels on Thursday and Friday, Morawiecki held talks with officials including Italian Prime Minister Paolo Gentiloni, European Commission chief Jean-Claude Juncker and French President Emmanuel Macron.